401 THAXTKR. — MONOGRAPH OF THE LABOULBENIACE^. 
Tins species, though closely allied to L. rachytelis, ol which it might at first sight appear to be an 
abnormal development, was found on several specimens of this small Arizona Pachytdes f always in the 
same general position and in no case varying from the type form illustrated in Fig. 10. The antheridial 
branch occupies a median position, the two antheridia diverging slightly on either side, and apparently 
arising from a very small stalk-cell. Its abnormally bent habit, its pointed and hunched perithelium, 
and its inflated primary outer appendage, consisting of two similar cells, basal and subbasal, distinguish 
ii clearly from L. punch ilata, L. Ozarnce and L. Pachytelis which are its nearest allies. 
Laboulbenia Texana Thaxter. 
The type form of this striking species has not again been observed since the original material was 
obtained on species of Brarhinus from Texas and Guatemala; but a number of forms on Brachin/m 
which approach it perhaps too closely for specific separation, have been distinguished as varieties. The 
type forms of these varieties, though occurring in widely separated localities, are absolutely identical, 
and show scarcely any variation and the same is true of the form previously described as L. rostellata, indi- 
viduals from Florida and from Montevideo being identical. The series of varieties as a whole, however, 
show certain gradations between extreme forms, and the character of the appendages, although subject 
to peculiar variations in luxuriance of development is, on the whole, so constant that I have concluded 
to retain varietal designations in all cases. This disposition of the forms must be, nevertheless, con- 
sidered as provisional ; and further study of material from the La Plata region, as yet unexamined, 
may indicate that a revision of this opinion is desirable. The present species is so closely allied to L. 
Packytelis, which also occurs on an allied host, that it would be difficult to distinguish a variety like 
return from some of its many variations. The varieties illustrated in the accompanying figures which have 
been greatly reduced (X 150) as compared with the other figures of the plate, may be distinguished as 
follows: 
Var. rostellata Thaxter. Plate LXIII, fig. 5. 
Proc. Am. Acad. Arts and Sci., Vol. XXXVIII, p. 55. June, 1902. L. c, Vol. XXXV, p. 199. Dec, 1899, 
as L. rostellata n. s. 
Perithecium about one half free, becoming more or less deeply suffused with blackish brown, relatively 
small, narrow and curved toward the appendages, distally monstrously developed, bulging terminally 
and externally to form a rounded prominence from the inner side of which the tip projects inward in the 
form of a blunt pointed, blackened outgrowth, the hyaline contrasting apex of which is bent slightly up- 
ward. Receptacle more or less suffused, sometimes deeply colored with blackish brown, cells I and II 
paler, slender, of nearly equal width, cell II longer; cells IV and V very broad, carrying out the insertion- 
cell free from the receptacle so that it becomes oblique or even vertical and lateral. Outer and inner 
appendages similar, bent away from the perithecium, their bases overlapping; consisting of a series of 
superposed cells which are successively smaller from below up, each bearing distally and externally a 
short tapering branch; all the branches brown, the subbasal septa blackened, all simple except the lower 
branch of the outer appendage which bears two or three short branchlets; the basal cell of the inner append- 
140-190 X 40-50 
400-550 /;; to insertion-cell 270-450 a. Appendages, 140-170 
50 (50 
in us 
anterior legs. 
Muscu 
At base of 
Specimens fron 
, , ,, * -~~ » immioneu are remarkably constant in character, the subbasal ana 
basal cells of the receptacle, however, usually forming a stalk which is more abruptly differentiated 
from the distal portion than is indicated by the individual represented in fig. 5. 
